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Dirac cone shift of a passivated topological Bi2Se3 interface state

Gregory S. Jenkins, Don C. Schmadel, Andrei B. Sushkov, H. Dennis Drew, Max Bichler, Gregor Koblmueller, Matthew Brahlek, Namrata Bansal, and Seongshik Oh
Phys. Rev. B 87, 155126 – Published 15 April 2013

Abstract

Gated terahertz cyclotron resonance measurements on epitaxial Bi2Se3 thin films capped with In2Se3 enable the first spectroscopic characterization of a single topological interface state from the vicinity of the Dirac point to above the conduction band edge. A precipitous drop in the scattering rate with Fermi energy is observed, which is interpreted as the surface state decoupling from bulk states and evidence of a shift of the Dirac point towards mid-gap. Near the Dirac point, potential fluctuations of 50 meV are deduced from an observed loss of differential optical spectral weight near the Dirac point. Potential fluctuations are reduced by a factor of two at higher surface Fermi levels in the vicinity of the conduction band edge inferred from the width of the scattering rate step. The passivated topological interface state attains a high mobility of 3500 cm2/V s near the Dirac point.

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  • Received 18 August 2012

DOI:https://doi.org/10.1103/PhysRevB.87.155126

©2013 American Physical Society

Authors & Affiliations

Gregory S. Jenkins* and Don C. Schmadel

  • Department of Physics, University of Maryland at College park, College Park, Maryland, 20742, USA and Center for Nanophysics and Advanced Materials, University of Maryland at College park, College Park, Maryland, 20742, USA

Andrei B. Sushkov and H. Dennis Drew

  • Department of Physics, University of Maryland at College park, College Park, Maryland, 20742, USA,
  • Center for Nanophysics and Advanced Materials, University of Maryland at College park, College Park, Maryland, 20742, USA, and Materials Research Science and Engineering Center, University of Maryland at College park, College Park, Maryland, 20742, USA

Max Bichler and Gregor Koblmueller

  • Walter Schottky Institut and Physik Department, Technische Universitat Munchen, D-85748 Garching, Germany

Matthew Brahlek, Namrata Bansal, and Seongshik Oh

  • Department of Physics and Astronomy, The State University of New Jersey, Piscataway, New Jersey 08854, USA

  • *gregjenkins@myfastmail.com

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Issue

Vol. 87, Iss. 15 — 15 April 2013

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